National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

San Marcos, San Marcos Municipal Airport (KHYI)

Lat: 29.89°NLon: 97.86°WElev: 597ft.

A Few Clouds

72°F

22°C

Humidity 55%
Wind Speed NW 9 mph
Barometer 30.09 in (1018.3 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 3 Feb 4:56 pm CST
Extended Forecast for

4 Miles SW San Marcos TX

  • Tonight

    Tonight: Partly cloudy, with a low around 45. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 45 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 66. North wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 66 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 38. North northwest wind 5 to 10 mph.

    Low: 38 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 66. North northwest wind around 5 mph becoming west southwest in the afternoon.

    High: 66 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 43. Calm wind becoming west around 5 mph in the evening.

    Low: 43 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 76. West wind around 5 mph.

    High: 76 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 45. South wind around 5 mph becoming west after midnight.

    Low: 45 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 77. West wind around 5 mph becoming south in the afternoon.

    High: 77 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 50. South southwest wind around 5 mph.

    Low: 50 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 45. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 66. North wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
Clear, with a low around 38. North northwest wind 5 to 10 mph.
Thursday
Sunny, with a high near 66. North northwest wind around 5 mph becoming west southwest in the afternoon.
Thursday Night
Clear, with a low around 43. Calm wind becoming west around 5 mph in the evening.
Friday
Sunny, with a high near 76. West wind around 5 mph.
Friday Night
Clear, with a low around 45. South wind around 5 mph becoming west after midnight.
Saturday
Sunny, with a high near 77. West wind around 5 mph becoming south in the afternoon.
Saturday Night
Mostly clear, with a low around 50. South southwest wind around 5 mph.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Mostly cloudy, with a low around 51.
Monday
A 20 percent chance of showers. Partly sunny, with a high near 76.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 54.
Tuesday
A 20 percent chance of showers. Partly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW San Marcos TX
 29.86°N 97.99°W (Elev. 748 ft)
Last Update:
4:32 pm CST Feb 3, 2026
Forecast Valid:
5pm CST Feb 3, 2026-6pm CST Feb 10, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation